import { type Context } from "@opentelemetry/api";
import type { ReadableSpan, Span, SpanProcessor as OtelSpanProcessor } from "@opentelemetry/sdk-trace-base";
import type { ExporterRegistry } from "./exporterRegistry.js";
/**
 * @description OpenTelemetry span processor that turns every observation span into `SpanData` and hands it to an `ExporterRegistry`, so one instrumentation feeds Langfuse, Datadog, Sentry and every other registered exporter. Spans that are not observations are skipped and their children are re-parented onto the nearest exported ancestor. Delivery never blocks the span's thread.
 */
export declare class ExporterSpanProcessor implements OtelSpanProcessor {
    private readonly registry;
    private readonly open;
    private readonly ended;
    /**
     * @description Creates a processor bound to a registry.
     * @param registry {ExporterRegistry} - Registry that receives every exported span.
     */
    constructor(registry: ExporterRegistry);
    /**
     * @description Copies the propagated Langfuse trace attributes (user, session, trace name, tags, metadata) from the parent context onto the new span and remembers it until it ends.
     * @param span {Span} - Span that just started.
     * @param parentContext {Context} - Context the span was started in.
     * @returns {void} Nothing.
     */
    onStart(span: Span, parentContext: Context): void;
    /**
     * @description Exports an ended observation span without waiting for the exporters.
     * @param span {ReadableSpan} - Span that just ended.
     * @returns {void} Nothing.
     */
    onEnd(span: ReadableSpan): void;
    /**
     * @description Flushes every exporter in the registry.
     * @returns {Promise<void>} Resolves when all exporters have flushed.
     */
    forceFlush(): Promise<void>;
    /**
     * @description Shuts down every exporter in the registry.
     * @returns {Promise<void>} Resolves when all exporters have shut down.
     */
    shutdown(): Promise<void>;
    private exportQuietly;
    private remember;
    private nearestExportedAncestor;
}
/**
 * @description Creates a span processor that feeds NeuroLink's observation spans to an exporter registry. Add it to a host `TracerProvider` to deliver spans through the registered exporters (such as `LangfuseExporter`) instead of `LangfuseSpanProcessor`.
 * @param registry {ExporterRegistry} - Registry to export to; defaults to the process-wide registry.
 * @returns {ExporterSpanProcessor} A processor ready to be added to a TracerProvider.
 * @example
 * const provider = new NodeTracerProvider({ spanProcessors: [createExporterSpanProcessor()] });
 */
export declare function createExporterSpanProcessor(registry?: ExporterRegistry): ExporterSpanProcessor;